Question: What is the award with the lowest maximum age whose for work is landscape architecture?
Paraphrase: Out of all awards for landscape architecture, which has the lowest maximum age?
SPARQL (Wikidata): select ?ent where { ?ent wdt:P31 wd:Q618779 . ?ent wdt:P4135 ?obj . ?ent wdt:P1686 wd:Q47844} ORDER BY ASC(?obj)LIMIT 5 
Answer: Peter-Joseph-Lenné-Preis